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171.
172.
关于最大平面图着色的探讨——希伍德的反例是4-色的 总被引:5,自引:0,他引:5
通过最大平面图和四色猜想的介绍及对最大平面图着色的分析,揭示了最大平面图着色是四色定理普遍证明的核心。应用证明五色定理的方法(肯普链),证明了希伍德的反例是4-色的,阐明了“希伍德的反例从5-色的到4-色的”具有深远的历史意义。 相似文献
173.
De Bont R 《Isis; an international review devoted to the history of science and its cultural influences》2003,94(4):604-630
Although he died in obscurity, the Belgian museum conservator Aimé Rutot (1847-1933) was one of the most famous European archaeologists between 1900 and 1920. The focus of his scientific interest was stone flints, which he claimed to be the oldest known human tools, so-called eoliths. Skeptics maintained that the flints showed no marks of human workmanship, but Rutot nevertheless managed to spread his "Eolithic theory" in an important part of the scientific community. This essay demonstrates how material objects--series of stone flints and sets of statues that purported to reconstruct prehistoric "races"--were given scientific meaning by Rutot. Rutot diffused his ideas by disseminating his stones and statues, thus enlarging his networks of influence. For a time he managed to be at the material center of a trade network as well as at the intellectual center of archaeological debate. The essay shows how Rutot achieved this status and how he eventually fell from favor among serious scientists. 相似文献
174.
Arnoud C. L. De Meyer 《Research Policy》1985,14(6):315-328
The flow of technological information, in particular the type of sources and transfer channels for technological information has been a focus of research interest since the very first studies concerning management of research and development. However, the results of these empirical studies, although encouraging and useful to managers, leave several questions unanswered, and even worse, contain some contradictions.In this paper we will try to explain some of these contradictions using the technology characteristics as an contingency factor. The model, which we will present has been tested in a twofold way: questionnaires were used to provide insight into the importance of some sources, while interviews on the basis of standardized problems led us to a better insight into sources and channels. 相似文献
175.
176.
陈德沛 《河北师范大学学报(哲学社会科学版)》2003,26(4):117-120
在英语中 ,有一些句子形式上是肯定的 ,但却表达一种否定的意义。所以在阅读理解英语文章时要注意语言环境 ,注意那些形肯意否的表达方式 ,切不可望文生义。 相似文献
177.
教育学面临的困境与思考 总被引:22,自引:0,他引:22
在现实中存在着对教育学的种种歪曲和误解 :作为一门独立的学科 ,它不受重视 ,甚至不被承认 ;它没有一个名正言顺的位置 ,没有自己的科学化逻辑与依据 ;它的现实性存在依据更多的不在于其丰富、深刻的理论 ,而在于指令、方法与技术。因此 ,反思教育学的状况、拯救教育学的命运 ,是今日教育学探究中迫切需要解决的根本性问题。 相似文献
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179.
Lovett MW De Palma M Frijters J Steinbach K Temple M Benson N Lacerenza L 《Journal of learning disabilities》2008,41(4):333-352
This article explores whether struggling readers from different primary language backgrounds differ in response to phonologically based remediation. Following random assignment to one of three reading interventions or to a special education reading control program, reading and reading-related outcomes of 166 struggling readers were assessed before, during, and following 105 intervention hours. Struggling readers met criteria for reading disability, were below average in oral language and verbal skills, and varied in English as a first language (EFL) versus English-language learner (ELL) status. The research-based interventions proved superior to the special education control on both reading outcomes and rate of growth. No differences were revealed for children of EFL or ELL status in intervention outcomes or growth during intervention. Oral language abilities at entry were highly predictive of final outcomes and of reading growth during intervention, with greater language impairment being associated with greater growth. 相似文献
180.
Book reviews 总被引:1,自引:0,他引:1